<?php
/**
 * Slipstream :: Highly adaptive dependency injection framework
 * Copyright 2010-2011 Ian Unruh (Xerof3ar)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace Slipstream\Extension;

use SplObjectStorage;
use Slipstream\ContainerInterface;
use Slipstream\Activation\SessionInterface;

/**
 *
 *
 * @author Ian Unruh (Xerof3ar) <ianunruh@gmail.com>
 * @since Class avaliable since release 1.0
 */
class BaseRegistry implements RegistryInterface
{
	/**
	 * @var ContainerInterface
	 */
	protected $container;
	
	/**
	 * @var SplObjectStorage<ExtensionInterface>
	 */
	protected $extensions;
	
	/**
	 * Class constructor
	 *
	 * @param ContainerInterface $container
	 * @return void
	 */
	public function __construct(ContainerInterface $container)
	{
		$this->container = $container;
		$this->extensions = new SplObjectStorage();
	}
	
	/**
	 * Registers an extension with this container
	 *
	 * @param ExtensionInterface $extension
	 * @return void
	 */
	public function register(ExtensionInterface $extension)
	{
		if(!$this->isRegistered($extension)) {
			$this->extensions->attach($extension);
			$extension->onExtensionRegister($this->container);
		}
	}
	
	/**
	 * Unregisters an extension from this container
	 *
	 * @param ExtensionInterface $extension
	 * @return void
	 */
	public function unregister(ExtensionInterface $extension)
	{
		if($this->isRegistered($extension)) {
			$this->extensions->detach($extension);
			$extension->onExtensionUnregister($this->container);
		}
	}
	
	/**
	 * Returns true if an extension is registered with the container
	 *
	 * @param ExtensionInterface $extension
	 * @return bool
	 */
	public function isRegistered(ExtensionInterface $extension)
	{
		return $this->extensions->contains($extension);
	}
	
	/**
	 * Returns the extensions registered with this container
	 * @return SplObjectStorage<ExtensionInterface>
	 */
	public function getExtensions()
	{
		return $this->extensions;
	}
	
	/**
	 * Returns the container that this registry belongs to
	 * @return ContainerInterface
	 */
	public function getContainer()
	{
		return $this->container;
	}
	
	/**
	 * Called when the container is initialized
	 * @return void
	 */
	public function onContainerInitialize()
	{
		foreach($this->extensions as $extension) {
			$extension->onContainerInitialize($this->container);
		}
	}
	
	/**
	 * Called when the container is shutdown
	 * @return void
	 */
	public function onContainerShutdown()
	{
		foreach($this->extensions as $extension) {
			$extension->onContainerShutdown($this->container);
		}
	}
	
	/**
	 * Called when an activation session begins
	 *
	 * @param SessionInterface $session
	 * @return void
	 */
	public function onSessionStart(SessionInterface $session)
	{
		foreach($this->extensions as $extension) {
			$extension->onSessionStart($this->container, $session);
		}
	}
	
	/**
	 * Called when an activation session finishes
	 *
	 * @param SessionInterface $session
	 * @return void
	 */
	public function onSessionFinish(SessionInterface $session)
	{
		foreach($this->extensions as $extension) {
			$extension->onSessionFinish($this->container, $session);
		}
	}
}